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dear enzo, it is customary to look at that range because higher frequencies may be > contaminated due to aliased cardiorespiratory artifacts (as well as with > high frequency motion artifacts in the borders of the brain). > i would expect any aliasing to affect all frequencies, especially if some of the really slow TRs are being used. from a signal processing perspective, this would be true at any TR that's not capable of sampling twice ( and practically speaking 2.5 times) the fast changing artifactual signal. cheers, satra